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van Velzen S, Anderson GE, Stone NC, Fraser M, Wevers T, Metzger BD, Jonker PG, van der Horst AJ, Staley TD, Mendez AJ, Miller-Jones JCA, Hodgkin ST, Campbell HC, Fender RP. A radio jet from the optical and x-ray bright stellar tidal disruption flare ASASSN-14li. Science 2016; 351:62-5. [PMID: 26612833 DOI: 10.1126/science.aad1182] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 11/13/2015] [Indexed: 11/02/2022]
Affiliation(s)
- S. van Velzen
- Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
| | - G. E. Anderson
- Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
- International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth WA 6845, Australia
| | - N. C. Stone
- Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA
| | - M. Fraser
- Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
| | - T. Wevers
- Department of Astrophysics, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
| | - B. D. Metzger
- Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA
| | - P. G. Jonker
- Department of Astrophysics, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
- SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands
| | - A. J. van der Horst
- Department of Physics, The George Washington University, 725 21st Street NW, Washington, DC 20052, USA
| | - T. D. Staley
- Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
| | - A. J. Mendez
- Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
| | - J. C. A. Miller-Jones
- International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth WA 6845, Australia
| | - S. T. Hodgkin
- Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
| | - H. C. Campbell
- Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
| | - R. P. Fender
- Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
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Abstract
The Milky Way galaxy contains a large, spherical component which is believed to harbor a substantial amount of unseen matter. Recent observations indirectly suggest that as much as half of this "dark matter" may be in the form of old, very cool white dwarfs, the remnants of an ancient population of stars as old as the galaxy itself. We conducted a survey to find faint, cool white dwarfs with large space velocities, indicative of their membership in the galaxy's spherical halo component. The survey reveals a substantial, directly observed population of old white dwarfs, too faint to be seen in previous surveys. This newly discovered population accounts for at least 2 percent of the halo dark matter. It provides a natural explanation for the indirect observations, and represents a direct detection of galactic halo dark matter.
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Affiliation(s)
- B R Oppenheimer
- Astronomy Department, University of California-Berkeley, Berkeley, CA 94720-3411, USA.
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